Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 18/70 from 81/72

1st number: 1 9/72, 2nd number: 18/70

81/72 - 18/70 is 243/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 70 is 2520
  2. For the 1st fraction, since 72 × 35 = 2520,
    81/72 = 81 × 35/72 × 35 = 2835/2520
  3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
    18/70 = 18 × 36/70 × 36 = 648/2520
  4. Subtract the two fractions:
    2835/2520 - 648/2520 = 2835 - 648/2520 = 2187/2520
  5. After reducing the fraction, the answer is 243/280

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

© everydaycalculation.com